I think that the Optus guys are getting confused about the static IP address. You don't need to lose your normal dynamic IP. All you're trying to do is set up a static IP so that your router can recognise your computer & port forwarding works.

Wondering Why (one of the mods here) had a shouting match with Optus recently about exactly the same thing Once she explained that she just wanted to port forward, they ended up giving her the info she needed. Send her a PM (click on the blue link with her name) & she'll be able to give you more info
wondering why

As for the Ghost thing...I'll ask around for you!